Made in Taiwan
The inner tube is straight
The direction of the upper and lower side branches is opposite
There are four types of grinding mouth on the lower end of the tube body:
1. Both the upper and lower ends are ground
2. No grinding
3. Grinding the upper end
4. Standard grinding mout
| 型號 | 形式 |
| DG502105 | upper and lower grinding mouth/L200mm |
| DG502110 | upper and lower grinding mouth/L300mm |
| DG502115 | upper and lower grinding mouth/L400mm |
| DG502120 | upper and lower grinding mouth/L500mm |
| DG502805 | Lower grinding mouth/L200mm |
| DG502810 | Lower grinding mouth/L300mm |
| DG502815 | Lower grinding mouth/L400mm |
| DG502820 | Lower grinding mouth/L500mm |
